<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script type="text/javascript" src="../js/vue.js"></script>
  <title>引出生命周期</title>
</head>
<body>
  <div id="root">
    <h2 :style="{opacity}">欢迎学习Vue</h2>
  </div>
  <script type="text/javascript">
    new Vue({
      el:'#root',
      data:{
        opacity:1,
      },
      //Vue完成模板的解析并把初始的真实Dom元素放入页面后（挂载完毕）调用mouted
      mounted(){
        setInterval(()=>{
          this.opacity-=0.001
          if(this.opacity<=0) this.opacity=1
        },1)
      }
    })
  </script>
</body>
</html>